CN216642140U - Inflatable heat insulation blanket for protecting tunnel face of permafrost tunnel - Google Patents
Inflatable heat insulation blanket for protecting tunnel face of permafrost tunnel Download PDFInfo
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- CN216642140U CN216642140U CN202123236230.2U CN202123236230U CN216642140U CN 216642140 U CN216642140 U CN 216642140U CN 202123236230 U CN202123236230 U CN 202123236230U CN 216642140 U CN216642140 U CN 216642140U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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Abstract
The utility model discloses an inflatable heat insulation blanket for protecting a tunnel face of a permafrost tunnel. It comprises an annular fixed support, a grid type inflatable heat insulation blanket and a geotextile protective layer. The grid type inflatable heat insulation blanket fully utilizes the low heat conductivity that the heat conductivity coefficient of sealing air is far smaller than that of heat insulation materials with the same thickness, adopts Portable Polypropylene (PP) woven cloth and Polyethylene (PE) co-extrusion composite film to form a grid chamber, and when in use, the grid chamber is inflated to form a heat insulation layer, can be quickly suspended after being excavated, covers the exposed face, prevents hot air in the hole from exchanging heat with frozen soil on the face, maintains the original state of the frozen soil, and keeps the frozen soil face stable. The inflatable heat insulation blanket has the advantages of good heat insulation effect, light weight, convenience in inflation, rapidness in installation, reusability and easiness in popularization.
Description
Technical Field
The utility model belongs to the technical field of permafrost tunnel construction in cold regions, and particularly relates to an inflatable heat insulation blanket for protecting a tunnel face of a permafrost tunnel.
The background art comprises the following steps:
in the construction of permafrost sections in cold regions, the permafrost surrounding rocks have good self-stability and the tunnel faces can be upright after excavation, but the temperature in the tunnel can rise to over 0 ℃ due to the heat dissipation of construction machinery in the tunnel, the hydration heat generated by the construction of spraying concrete in the tunnel and building lining concrete and the inflow of hot air outside the tunnel, so that the temperature of the original stratum can be changed, the frozen soil layer is melted, particularly the exposed tunnel faces, the surrounding rocks of the tunnel faces are easy to be unstable due to large exposed area and large thermal cycle influence range, hot melt collapse is formed, constructors and buried construction equipment are injured, and the construction safety and construction progress are seriously influenced.
Therefore, the frozen state of the frozen soil on the tunnel face needs to be maintained, the frozen soil is protected and the melting is controlled, and the method is a very important construction step in the construction of the frozen soil, however, in the actual construction, no effective measure is available for carrying out heat insulation protection on the frozen soil on the tunnel face at present.
The utility model has the following contents:
in view of the above, the utility model provides an inflatable heat insulation blanket for protecting a tunnel face of a permafrost tunnel, in order to solve the technical problem that the tunnel face of the permafrost tunnel in the prior art is easy to melt, and is easy to melt, slide and collapse even collapse.
In order to solve the problems, the technical scheme adopted by the utility model is as follows: an inflatable heat insulation blanket for protecting the tunnel face of a permafrost tunnel is characterized by comprising a grid type inflatable heat insulation blanket, a geotextile protection layer and an annular fixing support which are spliced into a whole;
the heat insulation blanket is fixed in a tunnel face through an annular fixing support, the geotextile protection layer is arranged on the outer side surface of the heat insulation blanket to prevent the heat insulation blanket from being damaged when concrete is sprayed, and a plurality of reserved hanging holes are formed in the upper side and the lower side of the heat insulation blanket and the periphery of the geotextile protection layer;
annular fixed bolster by annular steel pipe according to face excavation profile assemble and form, the interval is provided with the welding ring on the annular steel pipe, sets up fixed rope in the welding ring, annular steel pipe bottom both ends are equipped with support bracket.
Furthermore, the bottom of each heat insulation blanket is provided with an air charging valve and an air discharging valve, air pipes of the air charging valve and the air discharging valve are connected with each cell of the heat insulation blanket for air charging and air discharging, and the heat insulation blankets are connected into a whole through metal snap fasteners arranged at the edges of the heat insulation blankets.
Furthermore, the support bracket comprises bottom steel plate, steel pipe sleeve and diagonal bracing steel pipe, steel pipe sleeve weld on bottom steel plate, be provided with the diagonal bracing steel pipe between steel pipe sleeve and the bottom steel plate.
Further, the heat insulation blanket is made of a polypropylene woven cloth and a polyethylene co-extrusion composite film.
Compared with the prior art, the utility model has the following advantages:
1) the utility model fully utilizes the characteristics that air is the best heat insulation medium and the material is convenient to obtain, adopts the high-air-tightness PE layer and the PP woven cloth co-extrusion composite film to press the grid type inflatable heat insulation blanket, and has light weight, simple structure, convenient installation and good heat insulation effect;
2) the inflatable heat insulation blanket completely covers the tunnel face, so that heat exchange between hot air in the tunnel and frozen soil on the tunnel face can be effectively prevented, the temperature of the frozen soil on the tunnel face is maintained in an original state, the tunnel face is prevented from hot melting and slipping, and the construction safety is ensured;
3) the heat insulation blanket is made into a strip shape according to the profile section of the tunnel, so that the heat insulation blanket is ensured to completely cover the tunnel face; the strip-shaped grating is adopted for assembling in blocks, and the assembly is easy to check and replace when being damaged.
4) The inflatable heat insulation blanket is not influenced by the humid environment in the hole, the repeated change of the air temperature and the like, has good adaptability, and can be detached at any time and reused.
5) The utility model has the advantages of simple structure, light weight, convenient paving and hanging, good heat insulation effect, repeated use, low processing and using cost and easy popularization.
Drawings
FIG. 1 is a schematic cross-sectional view of the blanket of the present invention;
FIG. 2 is a longitudinal cross-sectional view of a tunnel according to the present invention;
FIG. 3 is a schematic view of a single inflatable insulation blanket provided by the present invention;
FIG. 4 is a schematic view of the fastening and installation of two adjacent inflatable heat insulation blankets;
fig. 5 is a schematic view of an annular fixed support.
Description of the labeling: 1-inflatable heat insulation blanket, 2-geotextile protective layer, 3-annular fixed support, 4-tunnel face, 5-tunnel wall, 6-heat insulation blanket, 7-vent pipe, 8-hanging hole, 9-metal snap fastener and 10-fixed anchor rod;
3-1-support bracket, 3-2-annular steel tube, 3-3-circular ring, and 3-4-fixed rope;
3-1-1-bottom steel plate, 3-1-2-steel pipe sleeve and 3-1-3-oblique supporting steel pipe;
7-1-charge/discharge valve, 7-2-charge/discharge port;
9-1-male buckle and 9-2-female buckle.
Detailed Description
The embodiments of the utility model will be further explained with reference to the accompanying drawings:
the heat insulation blanket fully utilizes the characteristic that the heat conductivity coefficient of the sealing air is far smaller than that of a heat insulation material with the same thickness, the cavity of the heat insulation blanket grating is filled with gas to form an air bag with a certain thickness, the heat insulation blanket is attached to the exposed face, heat exchange between the hot air in the hole and frozen soil on the face is prevented, and the frozen soil on the face is kept from melting.
The embodiment provides an inflatable heat insulation blanket for protecting a tunnel face of a permafrost tunnel, which comprises a grid type inflatable heat insulation blanket 1, a geotextile protective layer 2 and an annular fixing support 3 which are spliced into a whole, and as shown in fig. 1, 2 and 3, the heat insulation blanket is spliced into an excavation face shape to cover an exposed tunnel face 4.
The heat insulation blanket is made of a PP woven fabric co-extrusion composite film with a high-air-tightness PE layer attached inside, wherein the high-air-tightness PE layer is arranged on the inner layer, the composite film is made into a strip shape matched with the periphery of an excavated section, the strip shape is spliced to form a palm surface shape, the joint of the two sides of each heat insulation blanket is provided with a vent pipe 7 in a pressing mode, the vent pipe is communicated with each grid chamber through a gas filling/discharging hole 7-2, and the tail part of the vent pipe 7 is provided with a gas filling/discharging valve 7-1. The inflated blanket forms an air pocket, and the sealed air is used as the heat insulation layer, as shown in fig. 2.
The inflatable heat insulation blanket 1 is pressed into a strip cellular shape according to the contour of the tunnel, and the block heat insulation blankets are connected through metal snap fasteners 9 (female fasteners 9-2 and male fasteners 9-1) arranged at the seams at the two sides of the heat insulation blanket, as shown in fig. 5.
The fixing support 3 is composed of an annular steel pipe 3-2 and a supporting bracket 3-1, the annular steel pipe 3-2 is welded with the annular ring 3-3 at intervals, a fixing rope 3-4 is arranged in the annular ring 3-3, the supporting bracket 3-1 is composed of a bottom steel plate 3-1-1, a steel pipe sleeve 3-1-2 welded on the steel plate and an oblique supporting steel pipe 3-1-1, the steel pipe sleeve 3-1-2 is welded on the bottom steel plate 3-1-1, and the oblique supporting steel pipe 3-1-1 is arranged between the steel pipe sleeve 3-1-2 and the bottom steel plate 3-1-1, as shown in figure 5.
The utility model relates to a use method of an inflatable heat insulation blanket for protecting a tunnel face of a permafrost tunnel, which comprises the steps of extending a fixing rope 3-4 into a welding circular ring 3-3, erecting an annular steel pipe 3-2 close to an excavated tunnel face 4, inserting the bottom of the annular steel pipe 3-2 into a bottom support bracket 3-1 steel pipe sleeve 3-1-2 for fixation, arranging fixing anchor rods 10 at intervals along the annular steel pipe 3-2, and connecting the tail ends of the exposed anchor rods with the annular steel pipe 3-2; one end of a reserved fixing rope 3-4 is bound with the heat insulation blanket 1 and a reserved hanging hole 8 at the periphery of the geotextile protective layer 2, the heat insulation blanket and the geotextile at the periphery of the outer side are lifted by a manual rope pulling to cover the exposed tunnel face, and the other end of the rope is bound on the welding circular ring 3-3 after being tensioned.
The specific implementation process comprises the following steps:
1) according to the size and the shape of the section of the tunnel, a strip grid type heat insulation blanket 1 is processed, and the heat insulation blanket is made into strip grid cells consistent with the tunnel excavation outline by adopting a PP woven fabric co-extrusion composite film internally attached with a high-air-tightness PE layer. The joint of the two sides of the heat insulation blanket is provided with a vent pipe 7 in a pressing way, the vent pipe 7 is communicated with each cell through an air charging/discharging hole 7-2, and the tail part of the vent pipe 7 is provided with an air charging/discharging valve 7-1. Metal snap fasteners 9 are arranged at intervals at the joint part to avoid the vent pipe 7, the snap fasteners 9 consist of male fasteners 9-1 and female fasteners 9-2 which are arranged on two sides of the joint of the inflatable blanket, the length of each inflatable heat insulation blanket is slightly larger than the height of the corresponding hanging position of the tunnel, and the air inflation is carried out to check the sealing performance of the heat insulation blanket after splicing.
2) Assembling annular erection steel pipes 3-2, wherein the shape of each steel pipe is consistent with the excavation outline of the tunnel face, welding circular rings 3-3 at intervals of the annular steel pipes, presetting ropes 3-4 in the circular rings, and inserting the bottoms of the steel pipes into the steel pipe sleeves 3-1-2 of the support brackets 3-1 to be in place. And a radial short anchor rod 10 is arranged, and the exposed tail end of the anchor rod is connected with the annular steel pipe 3-2.
3) Assembling the heat insulation blankets 1, overlapping the seams of two adjacent heat insulation blankets, sequentially pressing the male buckle 9-1 and the female buckle 9-2 together, and so on to splice into a palm shape.
4) And (3) inflating the heat insulation blanket by using an air pump, sealing the air inlet valve 7-1 after the heat insulation blanket is full, checking whether the heat insulation blanket is full and air leaks, and repairing or locally replacing the heat insulation blanket when the heat insulation blanket is damaged.
5) And (3) additionally paving geotextile 2 with a certain height along the periphery of the heat insulation blanket, wherein threading suspension holes 8 are correspondingly reserved in the geotextile, and the hole positions of the geotextile correspond to the heat insulation blanket suspension holes 8.
6) Binding one end of a rope 3-4 with a preformed hole of the heat insulation blanket 1 and the geotextile 2, manually pulling the rope 3-4, lifting the heat insulation blanket to cover the exposed tunnel face 4, and fixing the other end of the rope on a circular steel pipe welding ring after tensioning.
7) After the construction cycle is completed, the ropes 3-4 are untied, the heat insulation blanket 1 and the geotextile protective layer 2 are disassembled, the annular steel pipe 3-2 is disassembled, and the support bracket 3-1 is moved away. The heat insulation blanket protection is required to be performed in the disassembly process, so that the heat insulation blanket is prevented from being scratched. And starting the next cycle construction, and erecting an annular steel frame 3 and hanging a heat insulation blanket 1 after the excavation is finished.
The utility model is not limited to the examples, and any equivalent changes to the technical solution of the utility model by a person skilled in the art after reading the description of the utility model are covered by the claims of the utility model.
Claims (4)
1. An inflatable heat insulation blanket for protecting the tunnel face of a permafrost tunnel is characterized by comprising a grid type inflatable heat insulation blanket (1), a geotextile protective layer (2) and an annular fixing support (3) which are spliced into a whole;
the heat insulation blanket (1) is fixed in a tunnel face (4) through an annular fixing support (3), the geotextile protection layer (2) is arranged on the outer side surface of the heat insulation blanket (1) to prevent the heat insulation blanket from being damaged when concrete is sprayed, and a plurality of reserved hanging holes (8) are formed in the upper side and the lower side of the heat insulation blanket (1) and the periphery of the geotextile protection layer (2);
the annular fixing support (3) is formed by assembling annular steel pipes (3-2) according to the excavation outline of a tunnel face, welding circular rings (3-3) are arranged on the annular steel pipes (3-2) at intervals, fixing ropes (3-4) are arranged in the welding circular rings (3-3), and supporting brackets (3-1) are arranged at two ends of the bottom of each annular steel pipe (3-2).
2. The inflatable heat insulation blanket for protecting the tunnel face of the permafrost tunnel according to claim 1, wherein the bottom of each heat insulation blanket is provided with an air charging valve and an air discharging valve, air pipes (7) of the air charging valve and the air discharging valve are connected with each cell of the heat insulation blanket for air charging and air discharging, and each heat insulation blanket is connected with each other through metal snap fasteners (9) arranged at the edge of the heat insulation blanket.
3. The inflatable heat insulation blanket for protecting the tunnel face of the permafrost tunnel according to claim 1 or 2, wherein the support bracket (3-1) is composed of a bottom steel plate (3-1-1), a steel tube sleeve (3-1-2) and an inclined support steel tube (3-1-3), the steel tube sleeve (3-1-2) is welded on the bottom steel plate (3-1-1), and the inclined support steel tube (3-1-3) is arranged between the steel tube sleeve (3-1-2) and the bottom steel plate (3-1-1).
4. The inflatable heat insulation blanket for protecting the tunnel face of the permafrost tunnel according to claim 3, wherein the heat insulation blanket is made of a polypropylene (PP) woven fabric and Polyethylene (PE) co-extrusion composite film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123236230.2U CN216642140U (en) | 2021-12-21 | 2021-12-21 | Inflatable heat insulation blanket for protecting tunnel face of permafrost tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123236230.2U CN216642140U (en) | 2021-12-21 | 2021-12-21 | Inflatable heat insulation blanket for protecting tunnel face of permafrost tunnel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216642140U true CN216642140U (en) | 2022-05-31 |
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ID=81744569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123236230.2U Active CN216642140U (en) | 2021-12-21 | 2021-12-21 | Inflatable heat insulation blanket for protecting tunnel face of permafrost tunnel |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216642140U (en) |
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2021
- 2021-12-21 CN CN202123236230.2U patent/CN216642140U/en active Active
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